基于星敏感器的跟瞄系统在轨标定方法

为分析空间跟瞄机构光轴误差问题，建立了星上跟瞄系统模型，介绍了跟瞄系统不同坐标系间的转换形式，分析了跟瞄机构光轴的误差形式，提出了多星敏光轴标定算法，介绍了标定过程中的坐标转换过程和误差计算方法，通过仿真验证了算法的正确性，并比较了随机误差对光轴标定的影响，同时在引入星敏感器全天识别算法的情况下对双星敏标定算法的正确性进行了验证，对精确度进行了分析。经仿真，双星敏算法标定精确度可达25”以内，比例系数K值小于0.01，在跟瞄相机与星敏同时工作的情况下解决了跟瞄相机的在轨标定问题。

Optical axis on-orbit calibration of the tracking and collimation system based on star trackers

To analyze the errors in the optical axis of tracking and collimation system, a star tracking and collimation system model is established. Transformations among various coordinates and the error terms in the system are introduced and analyzed. Algorithms regarding the optical axis calibration are proposed and are verified by simulations. The effect of stochastic errors on the optical axis calibration is discussed, and the accuracy and validity of the algorithms with regard to the calibration of double star trackers are verified. The simulation results show that the accuracy of the two-star calibration method can reach 25 arcs, and the K can be controlled below 0.01. In-orbit calibration is achieved with both cameras and star trackers working simultaneously.